var express = require('express');
var app = express();
var fs = require("fs");
var bodyParser = require('body-parser');
// Create application/x-www-form-urlencoded parser
var urlencodedParser = bodyParser.urlencoded({ extended: false })
var authenticatedUser = null;
app.use(express.static('public'));
app.get('/', function (req, res) {
  res.sendFile( __dirname + "/" + "sign.html" );
})

app.post('/login', urlencodedParser, function (req, res) {
// Prepare output in JSON format
  Email = req.body.Email;
  password = req.body.password;
  var valpass = [];
  var valEm = [];
  var valid = 1;
  valpass = password;
  valEm = Email;
  if(valpass.length == 0 || valEm.length == 0) {
    valid = 0;
 }
 if (valid == 0) {
  res.sendFile( __dirname + "/" + "sign.html" );
}
else if (valid == 1){
//  console.log(username);
//  console.log(password);

  fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
    data = JSON.parse( data );
    var flag = 0;
    for (var user in data) {
      if(Email == data[user].email && password == data[user].pass){flag = 1; authenticatedUser = user; break;}
      else{flag = 0;  } // we wil change file users.json data to(name,pass,email,id)
    }
    if(flag == 1){
      fs.readFile( __dirname + "/" + "tables.json", 'utf8', function (err1,) {
        JSON.stringify(data)
        tables_data = JSON.parse(tables_data);
        console.log(tables_data[user].html);
        res.end((tables_data[user].html));
      });

    }
    else{res.sendFile( __dirname + "/" + "sign.html" );}
  });
}
})
 app.post('/register', urlencodedParser, function (req, res) {
 // Prepare output in JSON format
   YourName = req.body.YourName;
   Email = req.body.Email;
   password = req.body.password;
 //console.log(username);
 //console.log(password);
 var valpass = [];
 var valEm = [];
 var name = [];
 name = YourName;
 valpass = password;
 valEm = Email;
 var slash = 0;
 var under = 0;
 var at = 0;
 var dot = 0;
 var valid = 1;
 if (valpass.length < 7 || valpass.length > 15) {
   valid = 0;
 }
 else if (valpass.length == 0 || valEm.length == 0 || name.length == 0) {
   valid = 0;
  }
  for(i = 0; i < valpass.length; i++)
  {
    if(valpass[i] == "/") {
      slash++;
        }
    else if (valpass[i]=="_") {
      under++;
    }
  }
  if(slash == 0 || under == 0){
    valid = 0;
  }
  for( i = 0; i < valEm.length; i++)
  {
    if(valEm[i] == "@") {
        at++;
        }

  }
  if (at == 0 ||  at > 1) {
    valid = 0;
  }
var re = /[A-Z0-9._%+-]+@[A-Z0-9.-]+.[A-Z]{2,4}/igm;
if (!re.test(Email))
{
  valid = 0;
}

  if (valid == 0) {
  // valid = 1;
   res.sendFile( __dirname + "/" + "sign.html" );
 }
 else if(valid == 1){
     fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
     data = JSON.parse( data );
     var flag = 0;
     for (var user in data) {
       if(Email == data[user].email){flag = 1; authenticatedUser = user; break;}
       else{flag = 0;  }
     }
     if(flag == 1){
       alert("you have been registered before");
       fs.readFile( __dirname + "/" + "tables.json", 'utf8', function (err1, tables_data) {
         tables_data = JSON.parse(tables_data);
         console.log(tables_data[user].html);
         res.end((tables_data[user].html));
       });

     }
     else{
             fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
              data = JSON.parse( data );
              data["user4"] = user["user4"];
              console.log( data );
              res.end( JSON.stringify(data));
              fs.writeFile(__dirname + "/" + "users.json",JSON.stringify(data), function (err) {
              if (err) return console.log(err);
              console.log(JSON.stringify(data));
               });

           });
     }
   });
 }
 })
 app.post('/save', urlencodedParser, function (req, res) {
 // Prepare output in JSON format
   body = req.body.body1;
   console.log(body);
   /*fs.readFile( __dirname + "/" + "tables.json", 'utf8', function (err, data) {
     data = JSON.parse( data );
     data[authenticatedUser].html = body;
     fs.writeFile(__dirname + "/" + "tables.json",JSON.stringify(data), function (err) {
        if (err) return console.log(err);
        console.log(JSON.stringify(data));
      });
  });
*/

  })

var server = app.listen(8081, function () {
var host = server.address().address
var port = server.address().port
console.log("Example app listening at http://%s:%s", host, port) })